The levels of MDA, SOD, and 8-OHdG in the FF detected via the relevant experimental kits significantly increased when compared with the non-PCOS group and were accompanied by a decrease in mtDNA levels in patients with PCOS (MDA: 1.558 ± 0.10 vs. 2.047 ± 0.23 nmol/mL; SOD: 58.71 ± 3.13 vs. 71.17 ± 5.03 U/mL; 8-OHdG: 0.7163 ± 0.06 vs. 0.9469 ± 0.10 ng/mL) (Figs. 2A–C). The gene discussed is SOD1; the disease is polycystic ovary syndrome.